Dell OptiPlex E1, Reference And Installation Manual, Page: 48 / 158

2-14 Dell OptiPlex E1 Managed PC Reference and Installation Guide
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For certain types of monitors and most EIDE hard-disk drives, you can reduce system
power consumption by enabling the power management feature. With Power
Management enabled, these monitors and drives automatically switch into low-power
mode during periods of system inactivity.
Power Management can be implemented at three levels—Maximum, Regular, and
Minimum
.
(The different levels apply to the monitor only; hard-disk drive operation is
the same for all three.) The default setting for this category is Disabled.
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If you have a Video Electronics Standards Association (VESA
®
) Display Power Man-
agement Signaling (DPMS)-compliant monitor, enabling the Power Management
category reduces monitor power consumption during periods of keyboard and mouse
inactivity.
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NOTE: The power management feature monitors activity of a mouse connected to the
PS/2-compatible mouse port.
By setting Power Management to Maximum, Regular, or Minimum, you can set pre-
defined time-out periods (see Table 2-2) for the two successive monitor shutdown
stages,
standby and off.
NOTE: Each monitor manufacturer defines the details of the shutdown stages for its
own monitors. But in all cases, power consumption decreases with each stage from
“on” (full power) to “standby” (reduced power; the display image usually disappears)
to “off” (where power consumption is minimal). To define these stages for your mon-
itor, see the documentation that came with the monitor.
From either shutdown stage, you can return full power to the monitor in one of the fol-
lowing ways:
‡
For most DPMS-compliant monitors, any subsequent activity—including moving
the mouse—should return full power to the monitor.
‡
A few DPMS-compliant monitors require that you turn monitor power off and
then on again to return to full power.
Check your monitor documentation for information on how your monitor is designed
to operate.
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For most systems, enabling Power Management at any level causes EIDE hard-disk
drives to switch to low-power mode after about 20 minutes of system inactivity (see
Table 2-2).